toggle jquery

// view file

= f.input :use_metadata_fields, :label => "Choose one...", :as => :select, :collection => [["Fill in detailed metadata fields","1"], ["Use a default profile","0"]], :input_html => {:id => :use_metadata_fields, :class => 'input-small'}
#default_fields // a hash sign is the haml for div id
  = f.input :default_fields, :as => :select, :collection => @defaults, :method_label => :description
#metadata_fields
  = f.input :price
  = f.input :pub_date
  = f.input :imprint
  = f.input :category
  = f.input :bic
  = f.input :format
  = f.input :pages
  = f.input :blurb
  = f.input :selling_points

// jquery file
     $(document).ready(function () {
     toggler(); //first set things up properly on page load
    //this will call the toggler function every time the selection value of the use_metadata_fields field changes
     $("#use_metadata_fields").change(function () {
         toggler();
     });
   });
   function toggler() {
       if ($("#use_metadata_fields").val() == "1")  // of course jquery's comparative operator is a 'double equals'. facepalm. 
         {
            $("#metadata_fields").show();
            $("#default_fields").hide();
         } // and of course each line has a semi-colon at the end and both lines need to be wrapped in curly braces. sigh. 
       else
         {  
            $("#metadata_fields").hide();
            $("#default_fields").show();
         }   
   }